Eukaryotes have ____ type(s) of RNA polymerase.  

A.  two
B.  three
C.  four
D.  one
E.  64


B.  three

Biology & Microbiology

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Which of the following is the most important assumption for the mark-recapture method to estimate the size of wildlife populations?

A) All females in the population have the same litter size. B) More individuals emigrate from, as opposed to immigrate into, a population. C) Over 50% of the marked individuals need to be trapped during the recapture phase. D) There is a 50:50 ratio of males to females in the population before and after trapping and recapture. E) Marked individuals have the same probability of being recaptured as unmarked individuals during the recapture phase.

Biology & Microbiology

In true fishes, the gills primarily serve which

function? a. gas exchange b. feeding c. water elimination d. both feeding and gas exchange e. all of these

Biology & Microbiology

Which of the following is mismatched?

a. certain fungi; retinal destruction b. trachoma; damage to conjunctiva leading to blindness c. glaucoma; excess pressure of the aqueous humor d. astigmatism; vertical axis is longer than the horizontal axis of the eyeball e. cataract; gradual clouding of the lens

Biology & Microbiology

Raf is a ________ protein kinase that resides at the head of the _______.

a) serine/threonine. glucagon cascade b) serine/threonine, apoptosis cascade c) tyrosine, glucagon cascade d) serine/threonine, MAP kinase cascade e) tyrosine, MAP kinase cascade

Biology & Microbiology